By May the sun over Georgia is already strong, and the sunscreen aisle is suddenly very long. Sprays, lotions, sticks, mineral, chemical, SPF 15 to SPF 100. The good news is that the front of the bottle uses a small number of regulated terms, and once you know what they mean, the choice gets much easier.
What the SPF number tells you
SPF stands for sun protection factor. It describes how well a product, applied as directed, shields skin from the ultraviolet B rays that cause sunburn. A higher number means more protection, but the scale is not linear, and the jump from SPF 30 to SPF 50 is smaller than the numbers suggest.
Many dermatology organizations suggest SPF 30 or higher for time outdoors. What matters more than chasing a big number is applying enough product and reapplying it. Most people use far less than the amount the SPF rating assumes, which is why a generous layer of SPF 30 often serves better than a thin smear of something higher.
Why “broad spectrum” matters
SPF only measures UVB. Ultraviolet A rays reach deeper into the skin and are present all day and all year, even through clouds and window glass. A sunscreen labeled “broad spectrum” has passed a test showing it also protects against UVA. If a bottle does not say broad spectrum, it is only doing part of the job, no matter how high its SPF.
Water resistant is not waterproof
In the United States, sunscreen labels may not claim to be waterproof or sweatproof. Instead they can say “water resistant” followed by a time, usually 40 or 80 minutes. That number is how long the product kept its stated SPF during testing while the skin was in water. After that window, or after towel drying, you need to reapply. On a lake day or at the pool, that means reapplying more often than you probably think.
Mineral or chemical?
Mineral sunscreens rely on zinc oxide or titanium dioxide, which sit on the skin and scatter light. They can leave a faint white cast but tend to feel gentle, which is why many people with sensitive skin prefer them. Chemical sunscreens use filters that absorb UV and are often lighter and more transparent. Neither type is automatically better. The best sunscreen is the one you will actually wear, in the amount you actually need.
A short checklist for the shelf
- SPF 30 or higher for outdoor time
- The words “broad spectrum” on the front
- Water resistance if you will swim or sweat
- A texture you like well enough to reapply
- A date that has not passed, since sunscreen does lose effectiveness over time
Sunscreen is one piece of a larger habit that includes shade, hats and timing your outdoor hours. If you have questions about your own skin, a history of skin concerns or a reaction to a product, talk to your doctor or a dermatologist. They can help you choose what suits you, so that the rest of us can get back to enjoying the long, bright days ahead.